a=2

class Employee:
    name=''
    age=a
    position=''
    _count_=0

    def __init__(self,name='none',age=0,position='sapce'):
        self.name=name
        self.age=age
        self.position=position
        Employee._count_+=1
    def print_count(self):
        print("此类被实例化{}次".format(Employee._count_))

    def sayHello(self):
        print("Hello")

employee01=Employee()
employee02=Employee()

employee01.print_count()